Here we go again . . . MK4

[routercnc]

Some overdue updates . . .

To finish off the machining of the ballnut blocks. Chamfered 2 of the edges:


I swapped the 3 jaw over to the 4 jaw chuck and dialled it in using the bore I'd machined out on the CNC. Got it to within 0.05 mm, so pleased with that.


Drilled it out using a range of twist drills up to 25 mm, then bored it out to size


Three more to go:


Then used the CNC to spot out the 6 ballnut holes, then drilled and tapped then on the drill press:


Then onto the mounting holes on the underside. Again CNC spotting the holes, and then drilling and tapping the M8 holes on the drill press:


Checked it with a spare ballscrew - fits OK:

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Then onto the side support plates - spotting out all the holes:




Drilled out, counter bored, and tapped:

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Next parts are the tram plates. These connect the Y axis box structure (which contains the Z axis), to the Y axis bearing plates and allow the Z axis to be aligned in multiple planes to tram in the spindle. The adjustment will be made with M10 cup end grub screws before the main bolts are then tightened. I'll put a screenshot of the updated design in the future post.
Cutting them out:


Spotted, drilled, counter bored and tapped:


Here they are trial fitted to the side support plates (which then sit on the bearing blocks).

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Then onto parts of the Y axis box structure. Started with some eco-cast from aluminium warehouse. Nice and flat and in good condition:



Marking out the holes with a 3mm drill bit:


Then machined out the pockets which will take the 4off Z axis profile rails. I did a very fine finish pass with large overlap on the bottom of the pockets to get them as flat as possible. There is some adjustment when everything goes together but best to get it close as possible:


Quick check:


Cutout, drilled, counter bored, and tapped: